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And in general: who will guard the castle?! Or will you have to teleport back and forth throughout the game? And what if the main hero is in a location without a "base" at the moment of the castle attack? Then you have to trudge all the way back across seas and oceans?
Well, if you have a weak computer, then yes (although you can use an army that the hero hasn't recruited yet). But if a person or a computer is using the main army, then you still have to go home (or, if things are really bad, find a new base).